Alert archive / Colorado / Tornado Warnings in 2013

Tornado Warning 13, NWS Denver/Boulder, CO

May 27, 2013Logan County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at May 27, 2013, 5:03 PM MDT for Logan County, Colorado. It was in force for 27 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 27, 2013, 5:03 PM MDT (23:03 UTC)
Expired: May 27, 2013, 5:30 PM MDT
In force: 27 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.25 in

County Logan County, CO

The radar

The Cheyenne radar (KCYS), 172 km from the middle of the area, began a volume at 23:03 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 27, 1:19 PM MDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 11.1 hours before the alert went out and 106 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 4442 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: -4 m²/s²
0-3 km storm-relative helicity: 7 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

041 
WFUS55 KBOU 272303
TORBOU
COC075-272330-
/O.NEW.KBOU.TO.W.0013.130527T2303Z-130527T2330Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
503 PM MDT MON MAY 27 2013

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* TORNADO WARNING FOR...
  EASTERN LOGAN COUNTY IN NORTHEAST COLORADO...

* UNTIL 530 PM MDT
    
* AT 502 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED OVER PROCTOR...OR 17 MILES NORTHEAST OF
  STERLING...MOVING SOUTHEAST AT 20 MPH.

  HAZARD...DEVELOPING TORNADO AND HALF DOLLAR SIZE HAIL. 

  SOURCE...RADAR INDICATED ROTATION. 

  IMPACT...MOBILE HOMES WILL BE HEAVILY DAMAGED OR DESTROYED. 
           SIGNIFICANT DAMAGE TO ROOFS...WINDOWS AND VEHICLES WILL 
           OCCUR. FLYING DEBRIS WILL BE DEADLY TO PEOPLE AND 
           ANIMALS. EXTENSIVE TREE DAMAGE IS LIKELY. 

* LOCATIONS IMPACTED INCLUDE...
  FLEMING...ILIFF...CROOK AND PROCTOR. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! MOVE TO A BASEMENT OR AN INTERIOR ROOM ON THE LOWEST
FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A
VEHICLE OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND
PROTECT YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4083 10265 4066 10266 4060 10300 4081 10309
      4089 10291
TIME...MOT...LOC 2302Z 303DEG 18KT 4082 10295 

TORNADO...RADAR INDICATED
HAIL...1.25IN

$$

GIMMESTAD

1 follow-up statement

402 
WWUS55 KBOU 272322
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
522 PM MDT MON MAY 27 2013

COC075-272332-
/O.EXP.KBOU.TO.W.0013.000000T0000Z-130527T2330Z/
LOGAN CO-
522 PM MDT MON MAY 27 2013

...THE TORNADO WARNING FOR EASTERN LOGAN COUNTY WILL EXPIRE AT 530 PM
MDT...
                
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER APPEARS CAPABLE OF PRODUCING A TORNADO.
THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE.  HOWEVER GUSTY WINDS
ARE STILL POSSIBLE WITH THIS THUNDERSTORM.

LAT...LON 4083 10265 4066 10266 4060 10300 4081 10309
      4089 10291
TIME...MOT...LOC 2318Z 303DEG 18KT 4082 10295 

$$

GIMMESTAD

The office that day

Everything else NWS Denver/Boulder, CO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 27, 1:46 PM MDT	Severe Thunderstorm Warning	BOU	Washington	59 min
May 27, 3:51 PM MDT	Severe Thunderstorm Warning	BOU	Logan	39 min
May 27, 4:31 PM MDT	Tornado Warning	BOU	Logan	29 min
May 27, 5:21 PM MDT	Special Weather Statement	BOU	Logan	39 min
May 27, 5:32 PM MDT	Severe Thunderstorm Warning	BOU	Logan	28 min

Nearby

Tornado Warnings in Colorado, 2013 Every tornado warning in 2013 Tornadoes in 2013

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.